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  1. Bextreme04

    489ci tow build...

    I would stay away from keith black pistons. By the time you acquire and rebuild any of those heads, you could have just bought better aftermarket ones. If you are going to put factory iron heads on anything, your best bet is to go to a junkyard or find an L29 locally and just get the block/heads...
  2. Bextreme04

    k35 from Fresno, greetings all

    After some research I see that they didn't allow the 205 to pair to a TH400 until '79. Super weird. So if you had a TH350 or SM465 from 71-79 in a 1-ton, you could have the 205, but not if you had the TH400. Seems odd to only allow the strongest transfer case to be behind the weaker trans, but...
  3. Bextreme04

    489ci tow build...

    I am swapping my 350/TH400 for an L29/4L80. I just bought an entire 1997 K2500 Suburban that had the interior and suspension trashed for $500. Engine/trans started up and ran good enough to drive it home. I rebuilt the engine and trans with all new components for ~$3000 including bigger...
  4. Bextreme04

    k35 from Fresno, greetings all

    Odd to see a 203 paired to a TH400 in a 1-ton. Usually that would have been a 205.
  5. Bextreme04

    04 LM7 into 87 K5

    Yes. The issue would be if you are planning on using an electronic speedometer. If you are keeping the mechanical speedo on the output of the transfer case, then you will be fine as-is all the way around. No need for a 4lo switch and everything will just work.
  6. Bextreme04

    04 LM7 into 87 K5

    Pin 71 on the blue connector(C1) can be provided with a momentary ground to trigger Tow/Haul maps and Pin 16 on the green connector(C2) can be provided with a constant ground when in 4lo to trigger the 4lo tables. As stated above, if you are using the sensor off the adapter for VSS and you...
  7. Bextreme04

    04 LM7 into 87 K5

    You can... that's what the 4lo switch is for. You can also set "normal" and "performance" shift points using a tow/haul type momentary button. I have wiring schematics at home that call out what pins those connect to. They actually change the tables that the PCM is using for the shift points and...
  8. Bextreme04

    04 LM7 into 87 K5

    You have to think about what the PCM is seeing compared to what the vehicle is actually doing. If you have the VSS at the transfer case, then the VSS will always show the actual vehicle speed. The engine RPM will be MUCH higher for a given vehicle speed when in 4lo than it is in 4hi, which is...
  9. Bextreme04

    04 LM7 into 87 K5

    If you are picking the VSS signal off before the T-case, then it won't matter if you are in 4-lo or 4-hi. The shift schedule is based on vehicle speed and throttle position, and that won't change if you are in 4-hi or 4-lo based on that signal location. You can still adjust your shift points and...
  10. Bextreme04

    What have you done to your square lately??

    Speedway an Amazon both sell them as well. $1.99 each at speedway...
  11. Bextreme04

    Quadrajet Primary Shaft Bushings

    Gravity... If there is any little bit of a leak on the check valve in the pump, it will siphon the fuel right down to the air break point in the fuel bowl. So if you have the full height solid seat, that amount is the full seat height. If you have windowed it, now that amount is all the way to...
  12. Bextreme04

    Quadrajet Primary Shaft Bushings

    The windowed seat does allow more flow, which is good for performance builds, but the downside is it can allow the bowl to drain back more and therefore is not recommended for stockish street builds. If everything is tight and working right, it isn't really a concern, but if you have the...
  13. Bextreme04

    Drive shaft too short

    It's impossible to tell from your pics if it is even short. You should be able to unhook the driveshaft from the axle and then bottom out the yoke in the trans. make a mark on the yoke where it sits on the seal when bottomed out, then pull the yoke out enough to reconnect it. You should have...
  14. Bextreme04

    Rochester Quadrajet Woes

    Its not "air" that you need. It's "compression". Yes.. you do need air, but if it is being allowed to come in to the engine at the wrong time, you won't get any compression and it won't matter how much fuel or spark you have. In these cases I usually pull the plugs and inspect them. Check for...
  15. Bextreme04

    Rochester Quadrajet Woes

    Its not that you NEED the fiber floats. What he is saying is that they react differently and if you don't know what you are doing it becomes a problem. The setup instructions for setting float height are designed for a fiber float. The brass floats are heavier and don't have the same buoyancy...
  16. Bextreme04

    Rochester Quadrajet Woes

    To mimic the OEM electric choke trucks, it is recommended to wire that through an oil pressure switch. This will only provide power to the choke to pull it off when the engine is running. If you just run it through the ignition power you can't sit for any amount of time with the key on and...
  17. Bextreme04

    Rochester Quadrajet Woes

    The electric choke conversion for your Q-jet just replaces the thermostat bolted to the manifold with an electric one. You don't actually change anything on the carb itself. https://quadrajetpower.com/electric-choke-conversion-kit-chevrolet-350-400-71-78/
  18. Bextreme04

    Fuel problems

    It sounds like you have the return lines swapped on the valve or the valve is not switching properly. Make sure that the feed and return are going to the same tank in both switched positions(preferably by manually checking to make sure you have a continuous flow through the valve at only one...
  19. Bextreme04

    Rochester Quadrajet Woes

    This is a pretty good description of what should be happening, but I'll add a few caveats. Early quadrajets like this one only had one pull off on the front. That still appears to be present. The pull off actually keeps the rod from being able to extend when a high engine vacuum is present and...
  20. Bextreme04

    Big block running hot. Can’t figure out the issue

    oof... bummer. Glad you checked it though. If you had it dialed in near sea level and are now in Denver, I would start by dropping 2 jet sizes while you have it apart and see what you get. Since it will be apart to re-seal the plugs, you can just check to see what they have in there now and then...
  21. Bextreme04

    4.8/5.3 to 383

    You aren't going to get 383 actual displacement from an LS unless you start with an actual LS1. The math just doesn't work out for any other LS engine. TSP and several other manufacturers make actual 383 stroker kits for LS1 blocks...
  22. Bextreme04

    Big block running hot. Can’t figure out the issue

    Not necessarily. 14.7:1 is stoich for pure gasoline. Pure ethanol is 9.003:1. Almost all gasoline sold in the US is now E10(roughly 10% ethanol content), which usually drops the stoich ratio to ~14.1:1. That is crazy rich. That's rich enough that I'm surprised you don't have a hard time getting...
  23. Bextreme04

    Big block running hot. Can’t figure out the issue

    This is a serial flow block. Notice the lack of coolant holes on the exhaust side of the block surface below the head bolts in between the cylinders and also the large/small holes at the rear of the block deck surface. The correct series flow gasket will have matching holes just like the one...
  24. Bextreme04

    Big block running hot. Can’t figure out the issue

    It's impossible to know what the right head gasket is without seeing what the block surface looked like. Do you have a pic of it before you installed the heads?
  25. Bextreme04

    Big block running hot. Can’t figure out the issue

    There are two different things happening here. First, the regular rotation and reverse rotation water pump does not change the coolant path. It only changes the way the pump moves the coolant through the same path because the pump rotates the opposite direction on the serpentine belt systems...

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